哈尼梯田景观格局对地表水δ^(18)O海拔效应的影响  

Influence of landscape pattern on elevation effect of δ^(18)O in surface water in Hani Terrace

作　　者：刘澄静 角媛梅[1] 徐秋娥 杨艳芬 丁银平 刘志林 LIU Cheng-jing;JIAO Yuan-mei;XU Qiu-e;YANG Yan-fen;DING Yin-ping;LIU Zhi-lin(Faculty of Geography,Yunnan Normal University,Kunming 650500,China)

机构地区：[1]云南师范大学地理学部,昆明650500

出　　处：《应用生态学报》2022年第4期1083-1090,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41271203,41761115);云南师范大学2020年度博士研究生学术新人奖(01300202020503231)资助。

摘　　要：本研究以哈尼梯田文化景观遗产核心区的全福庄河小流域为对象,对在2015年5月—2016年4月间逐月采集的森林景观类型和梯田景观类型下12个样点的地表水样品进行氢氧稳定同位素组成和效应分析。结果表明:1)在地表水氢氧稳定同位素组成上,森林斑块δ^(18)O平均值小于梯田斑块,森林斑块δ^(18)O随时间的变化幅度也小于梯田斑块;2)研究区地表水δ^(18)O除8月和3月外,均具有显著的海拔效应,其一元线性回归方程为:δ^(18)O=-0.012H+13.84(r=-0.83,n=12);3)地表水δ^(18)O海拔梯度为-1.2‰·(100 m)^(-1),但并不是受降水影响的“真”海拔梯度,而是森林斑块和梯田斑块间地表水δ^(18)O景观梯度影响下的海拔梯度;4)在森林-梯田的景观格局组合下,森林斑块与梯田斑块间的地表水δ^(18)O值差异增强了海拔效应。因此,当流域景观格局异质性强时,地表水稳定同位素效应会被强化或者出现完全相反的同位素效应。With the Quanfuzhuang River basin located at Hani Rice Terrace core region as study area, we analyzed the isotopic composition and the effects of 12 surface water sampling sites for the forest landscape type and terrace landscape type from May 2015 to April 2016. The results showed that: 1) For the variation of isotope composition, both the average value and the variation range of δ^(18)O in surface water under forest patches were smaller than that under terrace patches. 2) The overall elevation effect of the hydrogen and oxygen stable isotopes in surface water was obvious, except that in August and March, which could be expressed as the linear regression equation δ^(18)O=-0.012H+13.84(r=-0.83, n=12). 3) The altitude gradient of δ^(18)O in surface water was-1.2‰·(100 m)^(-1), which was not the true altitude gradient affected by precipitation but by landscape gradient of δ^(18)O in surface water between forest patches and terrace patches. 4) Under the “Forest-Terrace” landscape pattern, the δ^(18)O differences in surface water between forest patches and terrace patches enhanced the elevation effect. Therefore, when landscape heterogeneity was strong, isotopic effect was strengthened, even with opposite isotope effect.

关 键 词：哈尼梯田 景观格局 氢氧稳定同位素 同位素海拔效应 地表水 

分 类 号：P901[天文地球—自然地理学]